1) a building designated for those (aka Christians) who are following the rules.
2) a place where Christians gather together in the name of euphoria, sing-a-longs, dress up, etc, in order to feel good about one's self.
3) a cult, view, religion, ideology, sect, etc.

1)If you are in a building where people listen to you and accept who you are as a person despite the circumstances, its not church, its an AA Meeting.